Mold for forming the walls of cisterns or wells



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'0. JOHNSON 8: J. J. SANDSTRONL MOLD FOR FORMING THE WALLS O-F GISTERNS 0R WELLS.

No. 246,783. Patented Sept. 6,1881.

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NITED STATES PATENT OFFICE.

OLOF JOHNSON AND J OHAN J. SANDSTROM, OF ALGONA, IOWA.

MOLD FOR FORMING THE WALLS F CISTERNS 0R WELLS.

SPECIFICATION forming part of Letters Patent No. 246,783, dated September 6, 1881.

Application filed April 20, 1881.

To all whom it may concern Be it known that we, OLOF JOHNSON and JOHANJ. SANDSTRGM, ofAlgona, in the county of Kossutll-and State of Iowa, have invented a new and useful Improvement in Molds for Forming the Walls of Oisterns and Wells, of which the following is a full, clear, and exact description.

The invention relates to the construction of sectional molds; and it consists in certain combinations ofparts, as hereinafter described.

In the accompanying drawings, Figure 1 is a central vertical section of an apparatus embodying our-improvements. Figs, 2, 3, and 4 are detail views, hereinafter referred to.

A represents a section of the mold, made of boards connected together by iron bands or straps B, and curved in the form of an arc of a circle, so that a number of said sections joined together will form a cylinder. Each strap B has a hinge-joint, b, at each end; and the terminal edges of the sections are made to fit each other with lap-joints, and when they are placed together a pin, 0, is passed through the hinge-joints b to form the pintle, so as to hinge the sections together. Then the mold is opened out for use it forms a cylinder with a smooth outside surface, as the edges of the sections lap each other, and the straps B and hinge-joints Z) are on the inside of the cylinder.v W'hen not in use the sections may be separated by removing the pins 0, or the mold may be rolled or folded, as shown in Fig. 4. The sections being hinged together to form the mold, it is held securely in the cylindrical form by means of two latches consisting of bars D pivoted to the straps ofone section, and having notches for engagement with pins or studs 0 on the straps of the section which meets said section to complete the cylinder. By means of these notches provision is made for opening the mold sufficiently to allow the insertion of an additional. board in case it is desired to slightly increase the circumference of the cylinder. The two latches are connected by a rod, F, having a handle,f, on its upper end, by which means they may both be raised simultaneously by a person at the top of the mold.

To the sections A, at points about equidis- (No model.)

tant in the circumference of the cylinder, are attached four straps, G, having rings 9 at their upper ends. These rings project slightly above the top edge of the cylinder and serve the double purpose of providing for hoisting the cylinder and also of keeping another cylinder in position when placed upon the first one when the apparatus is used for wells.

The top of the mold-is made in sections A in the same manner as the body, above described; but instead of being cylindrical it is tapering, so as to form a frusto-conical dome when in place on the cylinder, as shown in Fig. 1. The sections A are provided with hinge-joints b secured by pins, and the meeting-jointis fastened by latches D and pins or studsc similar to those above described. The frnstro-conical dome thus formed is placed upon the top of the cylinder above described, and on the top of said dome is placed a circular cover, H, which serves as a platform for the workman to stand upon.

In using this apparatus the hole for the cistern or well is made somewhat larger than the required diameter when finished. The mold is then placed in position in the hole and the cement or plaster is poured around it. When said cement or plaster is sufficiently hard and set the mold is removed by either separating the sections or by simply releasing the latches, so that the dome and the cylinder may be rolled or folded, as before described.

Having thus described our invention, we claim as new and desire to secure by Letters Patentl. The combination, with the sections A, of the pins or studs 0 and pivoted notchedlatches D, connected by the rod F, as shown and described, for the purpose specified.

2. The frusto-conical dome composed of the sections A provided with hinge-joints b .and latch -c0nnections D 0 in combination with the cylinder composed of sections A, as herein shown and described.

oLor JOHNSON. JOHAN JAKOB SANDSTROM.

Witnesses:

S. P. JOHNSON, A. W. M. GETOHEL. 

